On 7/28/06, Dieter <[EMAIL PROTECTED]> wrote:
> I think that it is the other way around. PC MotherBoards are going to
> request a VGA mode that needs to be supported. This VGA mode is only
> used until the OS loads a graphics driver. Linux uses VGA/VESA for text
> mode console so that is going to be needed unless we have a Kernel
> driver for console mode.
This seems like a good time for a reminder of the following. If the
system firmware wants to talk at say 640x480 but you have a fixed
frequency or limited multi-scan monitor that does not do 640x480,
the board needs to convert.
Our video controller design doesn't provision for scaling. And I
don't really see how to do scaling and not lose our programmability.
Either that, or it has to get a LOT more complicated.
We would have to insert something in there that's able to read two
scanlines at a time and does a weighted interpolation. Depending on
how we do it, it could also be rather inefficient with memory
bandwidth.
However, if something asks for 640x480, but we need to do 1152x900, we
could just put the lower res in the upper left corner of the display
or something.
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